CN110469310A - Sub-clustering fracturing process and application in a kind of inverted restricted section - Google Patents

Sub-clustering fracturing process and application in a kind of inverted restricted section Download PDF

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Publication number
CN110469310A
CN110469310A CN201910768001.3A CN201910768001A CN110469310A CN 110469310 A CN110469310 A CN 110469310A CN 201910768001 A CN201910768001 A CN 201910768001A CN 110469310 A CN110469310 A CN 110469310A
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China
Prior art keywords
substratum
pressure
inverted
restricted
sub
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Pending
Application number
CN201910768001.3A
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Chinese (zh)
Inventor
张燕明
郝瑞芬
问晓勇
李宪文
周长静
马占国
肖元相
史华
李红英
邝聃
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Petrochina Co Ltd
China Petroleum and Natural Gas Co Ltd
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China Petroleum and Natural Gas Co Ltd
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Priority to CN201910768001.3A priority Critical patent/CN110469310A/en
Publication of CN110469310A publication Critical patent/CN110469310A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/11Perforators; Permeators
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • E21B43/261Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation

Abstract

The invention belongs to sub-clustering fracturing process and applications in oil field low permeability gas reservoir stimulation technology field more particularly to a kind of inverted restricted section.The present invention is especially suitable for the small reservoirs of multilayer system reservoir crustal stress difference.The present invention is improved by design individual well pressure break perforating scheme and is segmented the success rate that more clusters temporarily block up turnaround fracture, improved the packing validity of temporarily stifled turnaround fracture, reliably increase crack quantity, is realized unlimited pole separate stratum fracfturing transformation, is achieved the purpose that reservoir is uniformly transformed;Pit shaft of the present invention is designed as big orifice, meets the demand of reservoir huge discharge transformation;Pit shaft full-bore after measure facilitates subsequent wellbore operations;The present invention is suitable for the measures to reform of straight well, directional well and horizontal well, new shaft building and the measures to reform for repeating transformation well;Due to solvable diverting agent used in the present invention, ground is all discharged after pressure, effectively reduces the injury to reservoir.

Description

Sub-clustering fracturing process and application in a kind of inverted restricted section
Technical field
The invention belongs in oil field low permeability gas reservoir stimulation technology field more particularly to a kind of inverted restricted section points Cluster fracturing process and application.
Background technique
The tight gas stock number in somewhere is big, and longitudinally more phases are stacked for sand body, generally develop 3-5 layers, and Lateral heterogeneity is strong, pressure Force coefficient is low 0.7~0.98, intrinsic fracture agensis, no natural production capacity.Mainly based on straight well and horizontal well development, straight well Mainly mechanical packer partial pressure multilayer, separate stratum fracturing of continuous oil pipe and bridge plug separate stratum fracfturing, horizontal well mainly use motionless pipe Column hydraulic sand blasting staged fracturing technique and bridge plug staged fracturing technique.
The transformation well of more clusters, especially horizontal well are segmented for above-mentioned gas field, horizontal well extends in the same target zone, Usually sub-clustering is transformed, and the reservoir pressure difference between every cluster after conventional layer and section pressure break, passes through underground between 1-3Mpa Micro-seismic monitoring discovery, crack initiation cluster random distribution insulate success rate about 70%, about there is phenomenon is ganged up between individual intervals 30% cluster or layer is unable to feed liquor, cannot be modified.Directly/directional well uses mechanical packer separate stratum fracfturing technique, connects Continuous oil pipe separate stratum fracfturing technique, bridge plug separate stratum fracfturing technique and temporary stall to fracturing technology, current limliting method staged fracturing technique all It is successively to be transformed according to depth of reservoirs bottom-to-top method, equally exists and insufficient problem is transformed.Especially temporary stall To staged fracturing temporary stall to be it is random, can not achieve the purpose that reservoir is sufficiently transformed.
Limited entry fracture treatment is constructed with discharge capacity as big as possible, is rubbed using borehole by strict control perforation holes quantity Resistance improves bottom pressure, forces fracturing fluid to shunt, presses off stratum similar in fracture pressure successively.
Summary of the invention
The present invention provides sub-clustering fracturing process and applications in a kind of inverted restricted section, and it is an object of the present invention to provide a kind of construction Process is simple, the high fracturing process of construction efficiency.
To achieve the above object, the technical solution adopted by the present invention is that:
Sub-clustering fracturing process in a kind of inverted restricted section, includes the following steps:
Step 1: reservoir layering
Reservoir is divided into N number of substratum according to the height of formation fracture pressure;
Step 2: planned well pressure break perforating scheme
Determine perforation fragment position, total perforation quantity, each substratum perforation quantity, perforation orientation and eye diameter parameter, Optimize the crack initiation sequence of substratum, the substratum fracture pressure for keeping fracture pressure low is lower, and the high substratum fracture pressure of fracture pressure is more It is high;
Step 3: perforation
After the completion of step 2, each pressure break substratum is successively penetrated out;
Step 4: pressure break
After the completion of step 3, the substratum of turnaround fracture elder generation crack initiation is temporarily blocked up using diverting agent;Then temporary stifled turnaround fracture the Until all substratum pressure breaks are complete, pressure break terminates the substratum of two crack initiations;
Step 5: layer drain is closed
After the completion of step 4, after temporarily blocking up material and all dissolving, layer drain is closed.
The division of each substratum is when interlayer pressure difference is more than or equal to 3MPa as one layer in the step one.
The crack initiation sequence for optimizing substratum in the step two is sorted according to the height of formation fracture pressure, is risen first The low substratum of fracture pressure is split, the substratum for keeping fracture pressure high wouldn't crack initiation.
The selection of perforation fragment position is on the top close to reservoir in the step two;Perforation orientation is 90 °;Eye diameter is 10.5mm, each substratum is according to one times of difference between the perforation quantity of crack initiation sequence;The high substratum of fracture pressure is than rupture Few 1-3 times of the eyelet number of the low substratum of pressure.
Total perforation quantity n is calculated using following formula in the step two:
Wherein:
Q --- operational discharge capacity, m3/min;
D --- borehole diameter, m;
α --- borehole flow parameter;
P --- construction pump pressure, MPa;
Δ p --- fracture pressure is poor, MPa.
The step is third is that successively penetrate out each pressure break substratum using perforating gun.
The method that the step four uses is inverted current limliting method.
It is the minimum substratum of fracture pressure that the substratum of turnaround fracture crack initiation at first is temporarily blocked up in the step four.
Temporarily stifled diverting material is thrown after complete first substratum of step four pressure break, and diverting agent is made to get lodged in first substratum seam Mouthful, after temporarily blocking up successfully by the variation judgement of ground construction pressure, start the next substratum of pressure break.
The application of sub-clustering fracturing process in a kind of inverted restricted section, by sub-clustering fracturing process in a kind of inverted restricted section It applies in the separate zone stimulation of low permeability gas field multilayer system's straight well or directional well.
The utility model has the advantages that
1, the present invention can ensure that layering/segmentation more clusters transformation wells every layer/section/cluster can normal crack initiation, temporarily block up diversion agent Also it can enter that predetermined level perhaps achievees the purpose that each section in cluster or every cluster is all modified.Due to not using packing The mechanical packings tool such as device, bridge plug, sliding sleeve, so that process is few, operating process is simple, at low cost and construction efficiency is high.
2, the present invention optimizes the crack initiation sequence of substratum, presses rupture due to being sorted according to the height of formation fracture pressure The high substratum of power wouldn't crack initiation, the first low substratum of crack initiation fracture pressure, and then improve be segmented more clusters temporarily block up turnaround fracture at Power;And the packing validity of temporarily stifled turnaround fracture is improved, it is reliable to increase crack quantity.
3, the present invention realizes unlimited pole separate stratum fracfturing transformation.
4, the present invention can be carried out fracturing work by casing, and pit shaft latus rectum is big compared with general oil pipe, can satisfy reservoir Demand is transformed in huge discharge;
5, pit shaft full-bore after fracturing reform of the present invention facilitates the wellbore operations such as subsequent lower flow string, well workover;
6, the present invention is suitable for the measures to reform of straight well, directional well and horizontal well;
7, the present invention is suitable for new shaft building and repeats the measures to reform that well is transformed;
8, ground is all discharged after the solvable diverting agent pressure that the present invention uses, effectively reduces the injury to reservoir.
The above description is only an overview of the technical scheme of the present invention, in order to better understand technology hand of the invention Section, and can be implemented in accordance with the contents of the specification, the following are presently preferred embodiments of the present invention, and detailed description is as follows.
Specific embodiment
The following is a clear and complete description of the technical scheme in the embodiments of the invention, it is clear that described embodiment Only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects It encloses.
Embodiment one:
Sub-clustering fracturing process in a kind of inverted restricted section, includes the following steps:
Step 1: reservoir layering
Reservoir is divided into N number of substratum according to the height of formation fracture pressure;
Step 2: planned well pressure break perforating scheme
Determine perforation fragment position, total perforation quantity, each substratum perforation quantity, perforation orientation and eye diameter parameter, Optimize the crack initiation sequence of substratum;
Step 3: perforation
After the completion of step 2, each pressure break substratum is successively penetrated out;
Step 4: pressure break
After the completion of step 3, the substratum of turnaround fracture elder generation crack initiation is temporarily blocked up using diverting agent;Then temporary stifled turnaround fracture the Until all substratum pressure breaks are complete, pressure break terminates the substratum of two crack initiations;
Step 5: layer drain is closed
After the completion of step 4, after temporarily blocking up material and all dissolving, layer drain is closed.
In actual use, the diverting agent in the present invention is using the temporary stifled material of the prior art, and the present invention is not due to Using the mechanical packings tool such as packer, bridge plug, sliding sleeve, so that process is few, operating process is simple and at low cost, construction efficiency It is high;The present invention sorts according to the low height of formation fracture pressure, optimizes the crack initiation sequence of substratum, and preferential crack initiation fracture pressure is low Substratum, the substratum for keeping fracture pressure high wouldn't crack initiation, effectively increase and be segmented more clusters and temporarily block up the success rate of turnaround fracture, improve The temporarily packing validity of stifled turnaround fracture, it is reliable to increase crack quantity;The present invention realizes unlimited pole separate stratum fracfturing transformation; The present invention can be carried out fracturing work by casing, and pit shaft latus rectum is big compared with general oil pipe, can satisfy the transformation of reservoir huge discharge Demand;Pit shaft full-bore after fracturing reform of the present invention facilitates the wellbore operations such as subsequent lower flow string, well workover;The present invention is applicable in In the measures to reform of straight well, directional well and horizontal well, new shaft building and repeat the measures to reform that well is transformed;It is used herein solvable Ground is all discharged after diverting agent pressure, reservoir damage is small.
Embodiment two:
Sub-clustering fracturing process in a kind of inverted restricted section, with embodiment one the difference is that: in the step one The division of each substratum is when interlayer pressure difference is more than or equal to 3MPa as one layer.
In actual use, adjustment perforation length, total in order to achieve the purpose that substratum crack initiation one by one rather than crack initiation simultaneously Perforation quantity, each substratum perforation quantity, perforation orientation and eye diameter parameter, the crack initiation sequence for optimizing substratum uses this Technical solution;By using the technical program, substratum one by one crack initiation just reached successively by fracturing reform rather than close lamination and split and change The purpose made.
Embodiment three:
Sub-clustering fracturing process in a kind of inverted restricted section, with embodiment one the difference is that: in the step two Optimize substratum crack initiation sequence be to be sorted according to the low height of formation fracture pressure, the substratum for keeping fracture pressure high wouldn't crack initiation, The low substratum of crack initiation fracture pressure first.
In actual use, using the technical program, the purpose of the transformation each substratum of reservoir can be sufficiently realized.If The low substratum of fracture pressure also crack initiation together, will be not achieved the mesh of successive crack initiation by the high substratum of preferential crack initiation fracture pressure 's.
Example IV:
Sub-clustering fracturing process in a kind of inverted restricted section, with embodiment one the difference is that: in the step two The selection of perforation fragment position is on the top close to reservoir;Perforation orientation is 90 °;Eye diameter is 10.5mm, and each substratum is pressed According to one times of difference between the perforation quantity of crack initiation sequence;The high substratum of fracture pressure lower than fracture pressure few 1-3 times of substratum Eyelet number.
In actual use, perforation fragment position is selected in close to the top of reservoir, is conducive to fracturing reform supporting crack section Filling, be typically also that reservoir properties explain best position, advantageously reduce the fracture pressure and operation pressure of fracturing reform, But also to consider the thickness of barrier bed, control critical eigenvalue extends in purpose reservoir, because in identical shot density, hole Eye arrangement more concentrates energy loss bigger, so as to cause the reduction of production capacity.
Embodiment five:
Sub-clustering fracturing process in a kind of inverted restricted section, with embodiment one the difference is that: in the step two Total perforation quantity n is calculated using following formula:
Wherein:
Q --- operational discharge capacity, m3/min;
D --- borehole diameter, m;
α --- borehole flow parameter;
P --- construction pump pressure, MPa;
Δ p --- fracture pressure is poor, MPa.
In actual use, total perforation quantity is determined according to total discharge capacity and construction technology, specific method of determination It is calculated and is determined using above-mentioned formula, in addition also to comprehensively consider perforation cost and the damage to casing, it cannot be too intensive.
Embodiment six:
Sub-clustering fracturing process in a kind of inverted restricted section, with embodiment one the difference is that: the step third is that Each pressure break substratum is successively penetrated out using perforating gun.
In actual use, each pressure break substratum is successively penetrated out using perforating gun, it is easily operated.Perforating gun is common work Tool obtains convenience, when Specific construction, does not need to increase other facilities, saves construction cost.
Embodiment seven:
Sub-clustering fracturing process in a kind of inverted restricted section, with embodiment one the difference is that: the step four is adopted Method is inverted current limliting method.
In actual use, the method that step 4 uses is the inverted current limliting method of the prior art.Traditional fracturing process is According to depth of reservoirs piecewise crack initiation from the bottom to top or the crack initiation simultaneously of several substratums, subdivision of reservoir cutting cannot be reached, improve storage The purpose of layer effectively development degree.Therefore the substratum that needs to keep fracture pressure high wouldn't crack initiation, preferential crack initiation fracture pressure is low Layer controls bottom pressure so inverted current limliting method passes through optimization design pressure break perforating scheme using inverted current limliting method, The lower preferential unlatching of the substratum fracture pressure for keeping fracture pressure low, the high substratum fracture pressure of fracture pressure are higher and later on Method.This method operating process is simple, and construction efficiency is high, can be improved and is segmented the success rate that more clusters temporarily block up turnaround fracture, can also The packing validity for improving temporarily stifled turnaround fracture, overcomes formation heterogeneity, reliable to increase crack quantity, meets and stores up in recent years Layer subdivision cutting, the transformation theory for improving the effective development degree of reservoir.When inverted current limliting method concrete application in the present invention, If the formation fracture pressure difference of two or multiple substratums is less than or equal to 3MPa, designing perforating scheme according to current limliting method makes it Crack initiation simultaneously, specific method is with reference to grandson at the article " brief talking limited entry fracture treatment technology and application " delivered.
Embodiment eight:
Sub-clustering fracturing process in a kind of inverted restricted section, with embodiment one the difference is that: in the step four Temporarily the substratum of stifled turnaround fracture crack initiation at first is the minimum substratum of fracture pressure.
In actual use, using technical solution of the present invention, reach subdivision of reservoir cutting purpose, and improve reservoir Effective development degree.And traditional fracturing process is according to depth of reservoirs piecewise crack initiation from the bottom to top or several substratums while to rise It splits, cannot achieve the purpose that subdivision of reservoir cutting, improve the effective development degree of reservoir.
Embodiment nine:
Sub-clustering fracturing process in a kind of inverted restricted section, with embodiment one the difference is that: step four pressure Temporarily stifled diverting material is thrown after having split the first substratum, so that diverting agent is got lodged in first substratum sealing, passes through the change of ground construction pressure Change after judging temporarily to block up successfully, starts the next substratum of pressure break.
In actual use, technical solution of the present invention is used, so that the crack that each substratum or every cluster generate is more multiple Hydridization has achieved the purpose that effectively to employ reservoir.
Embodiment ten:
The application of sub-clustering fracturing process in a kind of inverted restricted section, by sub-clustering fracturing process in a kind of inverted restricted section It applies in the separate zone stimulation of low permeability gas field multilayer system's straight well or directional well.
In conclusion the present invention is layered by reservoir, designs this well pressure break perforating scheme, perforation, pressure break and close layer drain Five steps improve and are segmented the success rate that more clusters temporarily block up turnaround fracture, improve the packing validity of temporarily stifled turnaround fracture, can That leans on increases crack quantity, realizes unlimited pole separate stratum fracfturing transformation;The big orifice of pit shaft of the present invention meets reservoir huge discharge Transformation demand;Pit shaft full-bore after measure facilitates subsequent wellbore operations;The present invention is suitable for straight well, pressure break of directional well etc. and arranges It applies transformation, new shaft building and repeats the measures to reform that well is transformed;Due to solvable diverting agent used in the present invention, all it is discharged after pressure Ground effectively reduces the injury to reservoir.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
In the absence of conflict, those skilled in the art can according to the actual situation will be relevant in above-mentioned each example Technical characteristic is combined with each other, and to reach corresponding technical effect, will not repeat them here particularly for various combined situations.
The above, only presently preferred embodiments of the present invention, the present invention be not intended to be limited to it is shown in this article this A little embodiments, and it is to fit to the widest scope consistent with principles disclosed herein and novel features.According to this hair Bright technical spirit any simple modification, equivalent change and modification to the above embodiments, still fall within the technology of the present invention In the range of scheme.

Claims (10)

1. sub-clustering fracturing process in a kind of inverted restricted section, which comprises the steps of:
Step 1: reservoir layering
Reservoir is divided into N number of substratum according to the height of formation fracture pressure;
Step 2: planned well pressure break perforating scheme
It determines perforation fragment position, total perforation quantity, each substratum perforation quantity, perforation orientation and eye diameter parameter, optimizes The crack initiation sequence of substratum, the substratum fracture pressure for keeping fracture pressure low is lower, and the high substratum fracture pressure of fracture pressure is higher;
Step 3: perforation
After the completion of step 2, each pressure break substratum is successively penetrated out;
Step 4: pressure break
After the completion of step 3, the substratum of turnaround fracture elder generation crack initiation is temporarily blocked up using diverting agent;Then temporarily stifled turnaround fracture second rises Until all substratum pressure breaks are complete, pressure break terminates the substratum split;
Step 5: layer drain is closed
After the completion of step 4, after temporarily blocking up material and all dissolving, layer drain is closed.
2. sub-clustering fracturing process in a kind of inverted restricted section as described in claim 1, it is characterised in that: the step one In each substratum division be when interlayer pressure difference be more than or equal to 3MPa when as one layer.
3. sub-clustering fracturing process in a kind of inverted restricted section as described in claim 1, it is characterised in that: the step two The crack initiation sequence of middle optimization substratum is sorted according to the low height of formation fracture pressure, first the low substratum of crack initiation fracture pressure, The substratum for keeping fracture pressure high wouldn't crack initiation.
4. sub-clustering fracturing process in a kind of inverted restricted section as described in claim 1, it is characterised in that: the step two Middle perforation fragment position selection is on the top close to reservoir;Perforation orientation is 90 °;Eye diameter is 10.5mm, each substratum According to one times of difference between the perforation quantity of crack initiation sequence;Substratum few 1-3 times lower than fracture pressure of the high substratum of fracture pressure Eyelet number.
5. sub-clustering fracturing process in a kind of inverted restricted section as described in claim 1, it is characterised in that: the step two In total perforation quantity n be calculated using following formula:
Wherein:
Q --- operational discharge capacity, m3/min;
D --- borehole diameter, m;
α --- borehole flow parameter;
P --- construction pump pressure, MPa;
Δ p --- fracture pressure is poor, MPa.
6. sub-clustering fracturing process in a kind of inverted restricted section as described in claim 1, it is characterised in that: the step three It is that each pressure break substratum is successively penetrated out using perforating gun.
7. sub-clustering fracturing process in a kind of inverted restricted section as described in claim 1, it is characterised in that: the step four The method of use is inverted current limliting method.
8. sub-clustering fracturing process in a kind of inverted restricted section as described in claim 1, it is characterised in that: the step four In temporarily block up turnaround fracture crack initiation at first substratum be the minimum substratum of fracture pressure.
9. sub-clustering fracturing process in a kind of inverted restricted section as described in claim 1, it is characterised in that: the step four Temporarily stifled diverting material is thrown after complete first substratum of pressure break, so that diverting agent is got lodged in first substratum sealing, is passed through ground construction pressure After variation judgement is temporarily blocked up successfully, start the next substratum of pressure break.
10. the application of sub-clustering fracturing process in a kind of inverted restricted section, it is characterised in that: by claim 1-9 any one Sub-clustering fracturing process applies the layering in low permeability gas field multilayer system's straight well or directional well in a kind of inverted restricted section In transformation.
CN201910768001.3A 2019-08-20 2019-08-20 Sub-clustering fracturing process and application in a kind of inverted restricted section Pending CN110469310A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3868996A (en) * 1974-05-15 1975-03-04 Shell Oil Co Buffer-regulated treating fluid positioning process
CN103470240A (en) * 2013-08-20 2013-12-25 中国石油天然气股份有限公司 Hydraulic fracturing method capable of combining clustering perforation and front pitching
CN105863595A (en) * 2016-05-06 2016-08-17 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 Whole-course temporary blocking and fracturing method and application thereof
CN107654215A (en) * 2017-09-19 2018-02-02 河南理工大学 A kind of method for coal bed gas well being transform as coal measures gas well
CN108343417A (en) * 2018-01-31 2018-07-31 中国石油天然气股份有限公司 A kind of gas well temporarily blocks up the methods and applications of separate zone stimulation
CN108661616A (en) * 2017-03-29 2018-10-16 中国石油化工股份有限公司 A kind of separate stratum fracfturing method suitable for sandstone reservoir

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3868996A (en) * 1974-05-15 1975-03-04 Shell Oil Co Buffer-regulated treating fluid positioning process
CN103470240A (en) * 2013-08-20 2013-12-25 中国石油天然气股份有限公司 Hydraulic fracturing method capable of combining clustering perforation and front pitching
CN105863595A (en) * 2016-05-06 2016-08-17 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 Whole-course temporary blocking and fracturing method and application thereof
CN108661616A (en) * 2017-03-29 2018-10-16 中国石油化工股份有限公司 A kind of separate stratum fracfturing method suitable for sandstone reservoir
CN107654215A (en) * 2017-09-19 2018-02-02 河南理工大学 A kind of method for coal bed gas well being transform as coal measures gas well
CN108343417A (en) * 2018-01-31 2018-07-31 中国石油天然气股份有限公司 A kind of gas well temporarily blocks up the methods and applications of separate zone stimulation

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